lib/tailor/rulers/allow_unnecessary_double_quotes_ruler.rb
require_relative '../ruler'
class Tailor
module Rulers
class AllowUnnecessaryDoubleQuotesRuler < Tailor::Ruler
def initialize(config, options)
super(config, options)
add_lexer_observers :nl
end
def nl_update(lexed_line, lineno, _)
quotes(lexed_line).each do |quote|
unless contains_embedded_expression?(quote) ||
contains_escape_sequence?(quote)
measure(lineno, column(quote.first))
end
end
end
# Checks to see if the double_quotes are unnecessary.
#
# @param [Fixnum] lineno Line the problem was found on.
# @param [Fixnum] column Column the problem was found on.
def measure(lineno, column)
@problems << Problem.new('unnecessary_double_quotes', lineno, column,
"Unnecessary double quotes at column #{column}, " +
'expected single quotes.', @options[:level])
end
private
def contains_embedded_expression?(tokens)
tokens.any? { |t| t[1] == :on_embexpr_beg }
end
def contains_escape_sequence?(tokens)
tokens.any? do |t|
t[1] == :on_tstring_content and t[2].match(/\\[a-z]+/)
end
end
def quotes(tokens)
tokens.select do |t|
true if (double_quote_start?(t))..(double_quote_end?(t))
end.slice_before { |t| double_quote_start?(t) }.reject { |q| q.empty? }
end
def column(token)
token[0][1]
end
def double_quote_start?(token)
token[1] == :on_tstring_beg and token[2] == '"'
end
def double_quote_end?(token)
token[1] == :on_tstring_end and token[2] == '"'
end
end
end
end